46. What is the passage mainly about?
(A) Hammill explored how to kill the mosquitoes.
(B) Mosquitoes often grow on branches of bromeliad.
(C) Damselfly larvae increased dramatically.
(D) Mosquitoes are eaten by damselfly larvae.
(E) Pesticides can increase the number of mosquito.

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統計： A(3), B(3), C(4), D(2), E(57) #2069485